Wirtschaftsrechnung is a free iPhone app designed for households in Germany to meticulously track their monthly expenses. The app facilitates participation in the Laufende Wirtschaftsrechnung (LWR) program, allowing users to record financial data conveniently. To get started, users need a smartphone or tablet along with a unique identifier and initial password provided by their local statistical office.

The app supports simultaneous use across multiple devices and allows data entry through both the mobile app and a web application. User data is securely transmitted to the local statistical office, where it is anonymized for processing and analysis. Notably, the app ensures that personal communication such as SMS or emails is never captured, prioritizing user privacy.